What is the "ringer blackness" of black smoke control? And what are the classification criteria?

Release time:

2022-08-09

Ringelmann blackness, also known as "smoke blackness", is an index reflecting the blackness (concentration) of boiler soot. Its unit is "level". The smaller the ringer's blackness, the less pollution to the environment. The commonly used detection methods are blackness comparison, telescope type ringerman blackness meter and digital photoelectric smoke meter. Ringermann blackness is a simple, low-cost monitoring method which can quickly evaluate the concentration of particulate pollutants in flue gas.

1、 Definition of ringermann Blackness:

The ringermann blackness of flue gas is one of the indexes to control the emission of flue gas pollutants from boiler (kiln). Ringerman blackness is a method to evaluate smoke blackness by visual method. It is divided into six levels: 0, 1, 2, 3, 4 and 5. Level 5 is the most serious pollution.

2、 Standards for controlling particulate matter in exhaust gas from pollution sources are mainly divided into two categories

The first is a quantitative evaluation method that is more prepared and objective. Taking the emission concentration as an indicator, a certain amount of particulate matter is collected by isokinetic sampling, and then the actual emission concentration or converted concentration of particulate matter is calculated by parameters such as the sampling volume under standard conditions and the weight gain before and after the oxygen level filter cartridge to determine whether it meets the emission standard.

The second category is smoke ringermann blackness, which is a method to monitor the visual blackness of smoke. Based on the physical and chemical properties such as particle size, color, odor, light refraction and scattering of particles, the emission concentration of particles can be semi quantitatively judged by instruments or by human senses.

Although there is no accurate corresponding relationship between the smoke blackness of ringerman and the concentration of particulate matter, this method has low cost and can quickly judge the change trend of the concentration of particulate matter. It is widely used by the environmental monitoring industry at home and abroad. Practice has proved that this method is a good monitoring method for flue gas particles emitted by coal-fired boilers. However, in the specific monitoring process, the visual judgment of the monitoring personnel, the monitoring meteorological conditions, statistical methods, the color of particles and the boiler operating conditions will affect the accuracy of the ringer Mann flue gas blackness. In this paper, the problems found in the monitoring process are analyzed and solved in order to reduce the measurement error of lingman smoke blackness and improve the accuracy of the monitoring method.

3、 Relevant problems of ringerman Blackness:

The country has not yet determined the method of lingman series, and the observation period, reading method and reading frequency are quite random. Its accuracy is affected by the meteorological conditions of monitoring equipment, the color of flue gas itself, the visual judgment of monitoring personnel, working conditions and other related factors.

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